JP3689650B2 - Load-bearing wall panels - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a load-bearing wall panel used for buildings such as medium- and low-rise office buildings, detached houses, and apartment houses, particularly steel-framed and lightweight steel-framed buildings.
[0002]
[Prior art and problems to be solved by the invention]
2. Description of the Related Art Conventionally, in steel-frame buildings, a load-bearing wall panel having a structure in which a non-perforated steel plate is joined to a frame around the panel and a horizontal force is borne by the shear strength of the steel plate is used. FIG. 16 shows the behavior of the load-bearing wall panel 51 when the load-bearing wall panel having such a configuration is installed and a horizontal force F is applied as shown in FIG. As can be seen from the figure, the increase in yield strength after buckling becomes significant. That is, even if a part of the steel plate yields, stress distribution is performed, so that the yield strength is not easily lowered. As a result, after the buckling, before the proof stress of the steel plate reaches the maximum, the outer peripheral frame of the load-bearing wall panel 51 is locally deformed or the joint portion is broken to be in a final state.
If the periphery of the load bearing wall panel 51 is secured so as not to be in such a state, the design becomes considerably excessive and not realistic. On the other hand, when the plate thickness of the steel plate is reduced, the initial rigidity is lowered and handling becomes difficult.
[0003]
In order to solve such a problem, as shown in FIG. 12 (A), it has been proposed to use a steel plate 53 formed with circular holes 54 distributed over almost the entire surface as a strength element. By using the steel plate 53 with the holes 54 in this way, it is possible to secure shear strength and high energy absorption capability due to deformation of the holes 54. That is, in addition to the overall deformation of the steel plate 53, the steel plate portion between the holes 54 undergoes shear deformation, so that energy is absorbed even after buckling. Therefore, deformation performance can be expected while reducing the increase in yield strength after yielding. The overall deformation of the steel plate 53 is also more flexible than the non-porous steel plate.
[0004]
However, as shown in FIG. 13, in the case of the load-bearing wall panel in which the perforated steel plate 53 is joined to the frame 52 (the portion indicated by oblique lines) on the outer periphery of the panel, the effect of the frame 52 restricts the entire steel plate 53. As a result, the rigidity more than the shear strength of pure perforated steel sheet is maintained. The behavior of the load-bearing wall panel constituted by the perforated steel plate 53 is shown. As can be seen from the figure, the deformation capability is increased by the deformation of the hole, but the rigidity of the load bearing wall panel is increased by the effect of the outer peripheral frame 52. For this reason, the flexible deformation performance of the load-bearing wall panel cannot be obtained, and the energy absorption capacity cannot be sufficiently increased. Further, there is a problem that a sound is generated when the steel plate 53 is deformed out of plane.
[0005]
An object of the present invention is to provide a load-bearing wall panel capable of obtaining a higher energy absorption capacity than when a simple perforated steel plate is used.
Another object of the present invention is to avoid the interference between the corners of the frame and the steel plate and to easily reinforce the corners of the frame.
Still another object of the present invention is to reduce noise during repeated loading, and to make the steel plate difficult to be bent during transportation and easy to handle.
Still another object of the present invention is to make it possible to omit the middle rail.
Still another object of the present invention is to obtain a stable behavior after buckling.
[0006]
[Means for Solving the Problems]
The load-bearing wall panel according to the present invention includes a frame on the outer periphery of the panel and a steel plate joined to the frame. The steel plate has a plurality of holes distributed over substantially the entire surface, and has a notch at a corner. It is characterized by.
According to this configuration, for the shear load acting on the load-bearing wall panel, by using a perforated steel sheet, an energy absorption effect is obtained, and the notch provided in the corner of the steel sheet absorbs excessive deformation, The burden on the corners of the frame is small. That is, because the corners of the steel plate are notched, the outer peripheral frame is cut for each side, and the force can be dispersed by restraining the frame, thereby obtaining pure deformation performance of the steel plate only by the oblique tension. Therefore, a higher energy absorption capacity than that of a simple perforated steel sheet can be obtained. Moreover, since there is a notch at the corner of the steel plate, it is possible to avoid the joint between the vertical frame member and the horizontal frame member of the outer peripheral frame from interfering with the steel plate. Therefore, it is easy to reinforce the joints of these frame materials. In addition, the said notch does not necessarily need to be provided in all the corners of a steel plate, for example, you may provide only in three corners of the four corners of a steel plate.
The notch may be continuous with a hole located at a corner of the steel plate among the holes.
[0007]
In the present invention, a plurality of the steel plates may be provided side by side in the longitudinal direction of the frame. In the case of this configuration, since a single steel plate can be small, it is easy to manufacture a perforated steel plate, and it is easy to store and transport it, thereby reducing costs. Thus, even if it divides | segments into several sheets, required horizontal yield strength is obtained effectively.
[0008]
In the present invention, the steel plate may be one in which a plurality of parallel straight ribs are distributed over substantially the entire surface.
When the ribs are provided in this manner, the steel plate is reinforced out of plane, so that deformation outside the plane is suppressed, and noise due to out-of-plane deformation during repeated loading is prevented. Moreover, it is hard to bend at the time of conveyance and is easy to handle.
The linear rib may be a bent portion such as a V-shape, for example, or may be a portion protruded by molding or the like.
[0009]
The plurality of parallel linear ribs may extend continuously in substantially the full width in a direction orthogonal to the longitudinal direction of the frame.
In this case, even if the horizontal rail of the frame is omitted, the steel plate is prevented from being bent out of the plane, and the horizontal rail can be omitted.
[0010]
In this invention, the said steel plate may have a notch in the intermediate part of the both-sides edge along the longitudinal direction of a flame | frame. Thus, by providing a notch not only in the corner portion but also in the middle of the long side in the steel plate, the energy absorption effect due to the notch can be made more effective when the frame has an elongated shape.
[0011]
In this invention, the steel plate may be provided with ribs around the holes. In this configuration, the ribs around the hole serve as out-of-plane reinforcement, and energy absorption after buckling is further ensured, and the behavior after buckling is stabilized. The out-of-plane reinforcement cannot be performed by welding a sleeve or the like with a thin-walled steel plate, but in this invention, the out-of-plane reinforcement is performed with ribs around the hole. Can be reinforced. The integral molding of the ribs around the hole can be performed by press molding or the like.
[0012]
Each said hole of a steel plate may be arranged in a line between adjacent linear ribs. Thus, by providing linear ribs for each row of holes, the reinforcing effect by the ribs can be enhanced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. The load-bearing wall panel 1 includes a frame 2 on the outer periphery of the panel and a steel plate 3 joined to the frame 2. The steel plate 3 is provided with a plurality of holes 4 distributed over substantially the entire surface and provided with notches 5 at each corner. A plurality of steel plates 3 are arranged in the longitudinal direction, which is the longitudinal direction of the frame 2.
The frame 2 is framed in a rectangular shape with vertical frame members 2a on both sides and horizontal frame members 2b on the upper and lower sides. In the middle portion of the frame 2 in the longitudinal direction, a plurality of lateral crosspieces 2c are provided. The middle rail 2c is provided along the adjacent edge of each steel plate 3 so that these edges can be joined. The vertical and horizontal frame members 2a and 2b and the intermediate crosspiece 2c are made of shaped steel, and for example, lightweight shaped steel such as a groove shape is used. In the illustrated example, as shown in an enlarged view in FIG. 2, the vertical frame material 2a is a combination material in which a vertical frame material main body 2aa to which the steel plate 3 is bonded and a column material 2ab are bonded. A grooved steel is used for the vertical frame member main body 2aa. The mutual joining of the vertical and horizontal frame members 2a and 2b and the joining of the intermediate rail 2c are joining by a shaft-like coupler 16 such as a rebed and a bolt, or welding joining such as spot welding.
The steel plate 3 is made of a thin steel plate having a thickness of about 1 mm, and is joined to the frame 2 by, for example, a shaft-like coupler (not shown) such as a rebed or a tapping screw, or spot welding. The steel plate 3 is also joined to the middle rail 2 c in the same manner as the joining to the frame 2.
[0014]
As shown in FIG. 1, the steel plate 3 is provided with a plurality of circular holes 4 that are evenly distributed over substantially the entire surface. These holes 4 are provided side by side in the vertical and horizontal directions. The arrangement of the holes 4 may be a staggered arrangement. The steel plate 3 has a rectangular shape, for example, a square shape, and is provided with a notch 5 at each corner of the four corners. The notches 5 are provided so as to be continuous with a part of the holes 4 located at the corners of the holes 4 provided in a distributed manner (in this example, a portion corresponding to approximately ¼ circle). . The shape of the notch 5 is a rectangular shape, but in addition to this, for example, it may be a shape obtained by cutting off a corner in a triangular shape with an oblique straight line, or may be an arc shape.
[0015]
According to this configuration, the shear load F acting on the load-bearing wall panel 1 is deformed as shown in FIG. 4. At this time, the use of the perforated steel plate 3 provides an energy absorption effect, and the steel plate 3 has a corner portion. Since the notch 5 provided absorbs excessive deformation, the burden on the corners of the frame 2 is small. That is, as schematically shown in FIG. 5, because of the notch 5 at each corner of the steel plate 3, the outer peripheral frame 2 is separated for each side, so that the force can be dispersed by the frame restraint. Pure deformation performance of the steel plate 3 by only tension can be obtained. Therefore, a higher energy absorption capacity than that of a simple perforated steel sheet can be obtained. Moreover, since the periphery restriction | limiting of the steel plate 3 is lose | eliminated by the notch 5, When this load-bearing wall panel 1 is installed in a building, the drawing-out force which a column base bears can be reduced.
Furthermore, since the notch 5 is present at the corner of the steel plate 3, it is possible to avoid the joint between the vertical frame member 2 a and the horizontal frame member 2 b of the outer peripheral frame 2 from interfering with the steel plate 3. Therefore, it is easy to reinforce the joints of these frame members 2a and 2b. For example, as shown in FIG. 3, a reinforcing plate 6 extending vertically and horizontally can be provided and joined to the frame members 2a and 2b to reinforce the frame joint portion.
As shown in FIG. 1, a plurality of steel plates 3 are provided side by side in the longitudinal direction of the frame 2, so that one steel plate 3 can be small, and the manufacture of the perforated steel plate 3 is easy, storage, It is easy to carry and can reduce costs. Thus, even if a plurality of steel plates 3 are provided, the required horizontal proof stress can be obtained effectively.
[0016]
FIG. 6 shows another embodiment of the present invention. In this embodiment, a steel plate 3 in which a plurality of parallel linear ribs 7 are distributed and provided over substantially the entire surface is used. These linear ribs 7 extend in a direction perpendicular to the longitudinal direction of the frame 2. The rib 7 is formed integrally with the steel plate 3 by bending the steel plate 3 into an inverted V shape, and continues to the full width of the steel plate 3. One long steel plate 3 is used for the long frame 3, and a notch 8 is formed in an intermediate portion of both side edges along the longitudinal direction. The middle notches 8 are provided at two places in the longitudinal direction, and these two notches 8 are positioned to divide the steel plate 3 into approximately three equal parts in the longitudinal direction. The notch 8 has a rectangular shape, is a size having two corner notches 5 combined, and has a width continuous to the two holes 5 arranged vertically.
The pitch between the ribs 7 of the steel plate 3 is an equal interval, but the interval between the ribs 7 is wider at the location where the central notch 8 is provided than at other locations. Moreover, each hole 5 of the steel plate 3 is arranged in a line between the adjacent linear ribs 7. The middle rail in the frame 2 is not provided.
Other configurations in this embodiment are the same as those in the first embodiment shown in FIGS.
[0017]
In the case of this embodiment, since a plurality of parallel ribs 7 are provided, the steel plate 3 is reinforced out of plane. Therefore, it is suppressed that the steel plate 3 deform | transforms out of a plane, and the noise by the out-of-plane deformation at the time of repeated loading is prevented. Moreover, it is hard to bend at the time of conveyance and is easy to handle. Note that the hysteresis characteristics of deformation of the load-bearing wall panel 1 due to the load of shear load are closer to the spindle type than the out-of-plane reinforcement by the ribs 7. In addition, since the plurality of parallel linear ribs 7 extend in a direction orthogonal to the longitudinal direction of the frame 1, the steel plate 3 is formed even if the cross rail 2 c (FIG. 1) of the frame 2 is omitted. It is prevented from bending out of plane. Further, since the steel plate 3 has not only the corner notch 5 but also the notch 8 in the middle portion of both side edges along the longitudinal direction of the frame 2, the steel plate 3 has a notch with respect to the load-bearing wall panel 1 in which the frame 2 has an elongated shape. 5 and 8 make the energy absorption effect more effective.
[0018]
In the embodiment of FIG. 6, the rib 7 of the steel plate 3 continues to the full width, but the rib 7 is formed intermittently in the rib length direction as shown in FIG. 7. There may be.
[0019]
8 and 9 are specific examples of the steel plate 3. In the steel plate 3 in the example of FIG. 2, two ribs 7 are provided in parallel as a pair between the holes 4. The interval L1 between the ribs 7 in each set is narrower than the interval L2 between the sets of ribs 7. Each rib 7 is bent in an inverted V shape. As an example of dimensions, the interval L1 is 50 mm, the interval L2 is 56 mm, the diameter D of the hole 4 is 50 mm, the height 7 of the rib 7 is 10 mm, and the half width b of the rib 7 is 5 mm.
The steel plate 3 having this configuration is used in place of the steel plate 3 in the load bearing wall panel 1 in the examples of FIGS. 1 and 4 and constitutes a load bearing wall panel.
In this way, when two ribs 7 are provided in parallel, the out-of-plane reinforcing effect by the ribs 7 can be obtained higher.
[0020]
10 and 11 are other specific examples of the steel plate 3. The steel plate 3 of the example of the figure is the steel plate 3 of the example of FIGS. 8 and 9 in which ribs 9 are integrally provided around each circular hole 5. The rib 9 has a cylindrical shape and is integrally formed by press molding or the like. The steel plate 3 having this configuration is also used instead of the steel plate 3 in the load bearing wall panel 1 in the examples of FIGS. 1 and 4 to constitute a load bearing wall panel.
Thus, when the rib 9 is provided around each hole 5, this rib 9 becomes out-of-plane reinforcement, energy absorption after buckling is further ensured, and the behavior after buckling is stabilized. As for the out-of-plane reinforcement, a thin steel plate cannot be welded to a sleeve or the like as in a thick steel plate. Can be reinforced. Further, since the linear rib 7 is provided together with the rib 9 around the hole 5, an out-of-plane reinforcing effect by the linear rib 7 can also be obtained.
[0021]
【The invention's effect】
The load-bearing wall panel according to the present invention includes a frame on the outer periphery of the panel and a steel plate joined to the frame. The steel plate has a plurality of holes distributed over substantially the entire surface, and has a notch at a corner. Therefore, a higher energy absorption capability can be obtained than when a simple perforated steel plate is used, and interference between the corners of the frame and the steel plates can be avoided, and the corners of the frame can be easily reinforced.
In the case where the steel plate has a plurality of parallel ribs distributed substantially on the entire surface and integrally provided, the ribs provide an out-of-plane reinforcement effect, and the noise during repeated loading is reduced. However, it is difficult to bend during transportation and easy to handle. If the linear rib extends in a direction perpendicular to the longitudinal direction of the frame, the middle rail can be omitted.
When the steel plate is provided with ribs around the holes, the behavior after buckling is stabilized.
[Brief description of the drawings]
FIG. 1 is a front view of a load-bearing wall panel according to an embodiment of the present invention.
FIG. 2 is a partially broken enlarged bottom view of the load-bearing wall panel.
FIG. 3 is an enlarged view of part III in FIG.
FIG. 4 is an explanatory diagram of a shearing force acting state of the load-bearing wall panel.
FIG. 5 is an explanatory diagram of a shearing force acting state schematically showing the load-bearing wall panel.
FIG. 6 is a front view of a load-bearing wall panel according to another embodiment of the present invention.
FIG. 7 is a front view of a load-bearing wall panel according to still another embodiment of the present invention.
FIG. 8 is a plan view of a specific example of a steel plate.
9A is a partially enlarged plan view of the steel sheet, and FIG. 9B is a partial side view thereof.
FIG. 10 is a plan view of another specific example of a steel plate.
11A is a partially enlarged plan view of the steel sheet, and FIG. 11B is a partial side view thereof.
FIG. 12 is an explanatory view before and after deformation of a steel plate according to a proposed example due to a shear load.
FIG. 13 is an explanatory view before and after deformation of a load-bearing wall panel using the steel plate due to a shear load.
FIG. 14 is a graph showing the behavior of a load-bearing wall panel composed of a perforated steel plate.
FIG. 15 is an explanatory diagram of a shear load acting on a load-bearing wall panel.
FIG. 16 is a graph showing the behavior of a load-bearing wall panel composed of a steel plate without holes.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Load-bearing wall panel 2 ... Frame 2a ... Vertical frame material 2b ... Horizontal frame material 2c ... Horizontal rail 3 ... Steel plate 4 ... Hole 5 ... Notch 7 ... Linear rib 8 ... Rib around a hole

Claims (8)

A frame having a frame on the outer periphery of the panel and a steel plate joined to the frame, wherein the steel plate has a plurality of holes distributed over substantially the entire surface, and a corner is provided with a notch. Wall panel. The load-bearing wall panel according to claim 1, wherein the notch is continuous with a hole located at a corner of the steel plate among the holes. The load-bearing wall panel according to claim 1 or 2, wherein a plurality of the steel plates are arranged in the longitudinal direction of the frame. The load-bearing wall panel according to any one of claims 1 to 3, wherein the steel plate is provided with a plurality of parallel linear ribs distributed substantially over the entire surface. The load-bearing wall panel according to claim 4, wherein the plurality of parallel linear ribs extend continuously in substantially the full width in a direction orthogonal to the longitudinal direction of the frame. The load-bearing wall panel according to any one of claims 1 to 5, wherein the steel plate has a notch in an intermediate portion between both side edges along the longitudinal direction of the frame. The load-bearing wall panel according to any one of claims 1 to 6, wherein the steel plate is provided with ribs around the holes. The load-bearing wall panel according to any one of claims 4 to 7, wherein each of the holes is arranged in a line between adjacent linear ribs.

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